for式でのパターンマッチ

gistfile1.scala

trait Secure {
  self: Controller =>
  
  @Before
  def check = parseAuthHeader match {
    case None => Unauthorized("Basic")
    case Some(user) =>
      renderArgs += "user" -> user
      Continue
  }

  private def parseAuthHeader: Option[User] = for {
    auth <- request.headers.lift("authorization")
    (email, password) <- parseAuthHeader(auth)
    user <- User.connect(email, password)
  } yield user
  
  /** returns Some(user, password) if header is parsable. */
  private def parseAuthHeader(header: Header): Option[(String, String)] = allCatch opt {
    val array = new String(decodeBase64(header.value.drop(6))).split(':')
    (array(0), array(1))
  }
  
  def logined: User = renderArgs.get("user", classOf[User])
  
}